 /*******************************************************************************
  * Copyright (c) 2000, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.update.internal.ui.wizards;
 import java.util.ArrayList ;

 import org.eclipse.core.runtime.jobs.Job;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.jface.wizard.IWizardPage;
 import org.eclipse.jface.wizard.Wizard;
 import org.eclipse.update.internal.core.UpdateCore;
 import org.eclipse.update.internal.search.SiteSearchCategory;
 import org.eclipse.update.internal.ui.UpdateUI;
 import org.eclipse.update.internal.ui.UpdateUIImages;
 import org.eclipse.update.internal.ui.UpdateUIMessages;
 import org.eclipse.update.search.BackLevelFilter;
 import org.eclipse.update.search.UpdateSearchRequest;
 import org.eclipse.update.search.UpdateSearchScope;
 import org.eclipse.update.ui.UpdateJob;

 public class InstallWizard
     extends Wizard
     implements ISearchProvider {
     private ModeSelectionPage modePage;
     private SitePage sitePage;
     private int installCount = 0;
     private UpdateSearchRequest searchRequest;
     private boolean needsRestart;
     private static boolean isRunning;
     private UpdateJob job;
     private InstallWizardOperation operation;


     public InstallWizard(UpdateSearchRequest searchRequest) {
         isRunning = true;
         if (searchRequest == null) {
             searchRequest =
                 new UpdateSearchRequest(
                     new SiteSearchCategory(true),
                     new UpdateSearchScope());
             searchRequest.addFilter(new BackLevelFilter());
         }
         this.searchRequest = searchRequest;
         setDialogSettings(UpdateUI.getDefault().getDialogSettings());
         setDefaultPageImageDescriptor(UpdateUIImages.DESC_UPDATE_WIZ);
         setForcePreviousAndNextButtons(true);
         setNeedsProgressMonitor(true);
         setWindowTitle(UpdateUIMessages.InstallWizard_wtitle);
     }

     public InstallWizard(UpdateSearchRequest searchRequest, ArrayList jobs) {
         this(searchRequest);
     }

     public boolean isRestartNeeded() {
         return installCount > 0 && needsRestart; // or == selectedJobs.length
 }

     public boolean performCancel() {
         isRunning = false;
         return super.performCancel();
     }

     public void addPages() {
         modePage = new ModeSelectionPage(searchRequest);
         addPage(modePage);
         sitePage = new SitePage(searchRequest);
         addPage(sitePage);
     }

     private void saveSettings() {
         if (modePage != null)
             modePage.saveSettings();
     }

     public IWizardPage getNextPage(IWizardPage page) {

         if (modePage != null && page.equals(modePage)) {
             boolean update = modePage.isUpdateMode();
             if (!update)
                 return sitePage;
         }
         return null;
     }

     /* (non-Javadoc)
      * @see org.eclipse.update.internal.ui.wizards.ISearchProvider2#getSearchRequest()
      */
     public UpdateSearchRequest getSearchRequest() {
         return searchRequest;
     }

     public static synchronized boolean isRunning() {
         return isRunning || Job.getJobManager().find(UpdateJob.FAMILY).length > 0;
     }

     /**
      * @see Wizard#performFinish()
      */
     public boolean performFinish() {

         saveSettings();
         
         if (Job.getJobManager().find(UpdateJob.FAMILY).length > 0) {
             // another update/install job is running, need to wait to finish or cancel old job
 boolean proceed = MessageDialog.openQuestion(
                     UpdateUI.getActiveWorkbenchShell(),
                     UpdateUIMessages.InstallWizard_anotherJobTitle,
                     UpdateUIMessages.InstallWizard_anotherJob);
             if (!proceed)
                 return false; // cancel this job, and let the old one go on
 }
         UpdateCore.getPlugin().getUpdateSession().reset();
         launchInBackground();
         isRunning = false;
         return true;
     }
     
     private void launchInBackground() {
         // Downloads the feature content in the background.
 // The job listener will then install the feature when download is finished.

         if (isUpdate())
             job = new UpdateJob(UpdateUIMessages.InstallWizard_jobName, false, false);
         else
             job = new UpdateJob(UpdateUIMessages.InstallWizard_jobName, searchRequest);
         job.setUser(true);
         job.setPriority(Job.INTERACTIVE);
 // if (wait) {
 // progressService.showInDialog(workbench.getActiveWorkbenchWindow().getShell(), job);
 // }
 getOperation().run(UpdateUI.getActiveWorkbenchShell(), job);
     }
     
     private InstallWizardOperation getOperation() {
         if (operation == null)
             operation = new InstallWizardOperation();
         return operation;
     }

     public boolean canFinish() {
               
         if ( modePage.isCurrentPage()) {
             return isUpdate();
         } else {
             return sitePage.isPageComplete();
         }
     }
     
     private boolean isUpdate() {
         return (modePage != null && modePage.isUpdateMode());
     }
 }

